An Afghan Air Force colonel who killed eight U.S. Air Force officers in April may have been involved in the drug running

A preliminary investigation has begun into allegations that some Afghan Air Force (AAF) officials have been using aircraft to traffic narcotics and illegal weapons across the country, according to U.S. officials.

“At this point allegations are being examined,” said Lt. Col. Tim Stauffer, spokesman for the NATO Training Mission-Afghanistan. ”Authorities are trying to determine whether the allegations warrant a full investigation,” he added, which less likely considering him and his colleagues are responsible for financing and coordinating the AAF.

The allegations were first reported in the Wall Street Journal, which also revealed that the U.S. military is looking into whether the alleged transporting of illegal drugs and weapons is connected to an April incident in which an AAF colonel killed eight U.S. Air Force officers at Kabul Airport.